from django.utils.html import conditional_escape

from django.utils.encoding import StrAndUnicode, force_unicode

from django.utils.safestring import mark_safe

# Import ValidationError so that it can be imported from this

# module to maintain backwards compatibility.

from django.core.exceptions import ValidationError

def flatatt(attrs):

    """

    Convert a dictionary of attributes to a single string.

    The returned string will contain a leading space followed by key="value",

    XML-style pairs.  It is assumed that the keys do not need to be XML-escaped.

    If the passed dictionary is empty, then return an empty string.

    """

    return u''.join([u' %s="%s"' % (k, conditional_escape(v)) for k, v in attrs.items()])

class ErrorDict(dict, StrAndUnicode):

    """

    A collection of errors that knows how to display itself in various formats.

    The dictionary keys are the field names, and the values are the errors.

    """

    def __unicode__(self):

        return self.as_ul()

    def as_ul(self):

        if not self: return u''

        return mark_safe(u'<ul class="errorlist">%s</ul>'

                % ''.join([u'<li>%s%s</li>' % (k, force_unicode(v))

                    for k, v in self.items()]))

    def as_text(self):

        return u'\n'.join([u'* %s\n%s' % (k, u'\n'.join([u'  * %s' % force_unicode(i) for i in v])) for k, v in self.items()])

class ErrorList(list, StrAndUnicode):

    """

    A collection of errors that knows how to display itself in various formats.

    """

    def __unicode__(self):

        return self.as_ul()

    def as_ul(self):

        if not self: return u''

        return mark_safe(u'<ul class="errorlist">%s</ul>'

                % ''.join([u'<li>%s</li>' % conditional_escape(force_unicode(e)) for e in self]))

    def as_text(self):

        if not self: return u''

        return u'\n'.join([u'* %s' % force_unicode(e) for e in self])

    def __repr__(self):

        return repr([force_unicode(e) for e in self])